Bolt cutter



une 24, 1930. i H BLUMENAUER EI'AL 1,768,108 l Y BOLT CUTTER Filed Julyl0, 1928 Patented June 24, 1930 narran stares PATENT' carica HENRY P.BLUMENAUER AND FRANK D. ERISSE, OF WORCESTER, MASSACHUSETTS,

AND WILLIAM C. BRESSE, OF DETROIT, MICHIGAN BOLT CUTTER Applicationfiled July 10,

This invention relates to a cutter for severing bolts and other piecesof wire and metal rods.

The principal objects of the invention are to provide means forinserting removable steel cutting jaws on the cutter; to provide aconfiguration of said jaws which will securely hold them in` exactlyproper position; and to provide an improved pivot oint for reducing thefriction. @ther objectsy and advantages of the invention will appearhereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 isa side view of a bolt cutter constructed in accordance with thisinvention;

Fig. 2 is an end view of the pivot point taken at the position of thearrow 2 in Fig. l.;

Fig. 3 is a sectional view on the line 3-3 of Fig. 2;

Fig. t is an end view of the jaws on enlarged scale; and

Fig. 5 is a side view of the jaws looking in the opposite direction fromthat in `which Fig. 1 is taken.

This bolt cutter is designed to be used in connection with thewell-known design now on the market, in which a pair of handle levers1() are pivoted together at 30 and provided with a pair of extensions 11secured to them by screws 12 and 13 and which support pivot bolts 14Cfor the jaw levers 15. These jaw levers, as is customary, are pivoted onbolts 16 carried by cross pieces 17. The

parts as so far described are all old and do not constitute a part ofthis invention eX- cept that we have selected them as being a convenientmeans for supporting and carrying the rest of the device.

The jaw levers are provided ordinarily with cutting jaws. In accordancewith the present invention these jaw levers are provided with notches 19formed on a practically central plane and having undercut slantingsurfaces 2O for a purpose to be described. The edges 21 of these jawlevers are also cut back on planes parallel with the surfaces 20.

A pair of steel jaws 22 are mounted on these jaw-levers.` By havingthese steel jaws made separate and secured by bolts 23, they 192s.serieu No. 291,618.

are readily removable and replaceable;v they I v22 is provided with acutting edge 24 loca-ted between the planes of the two slanting surfacesand 21. Thus pressure on the cutting edge is transmitted back to saidslanting :surfaces and tends to seat thejaw more firmly'there'om anddoes' not ytend to rock Ait about any partof itssupport.` The main body22L of each jaw is perforated Yto receive the bolt 23, and hastwosurfaces fitting the vsurfaces 20 and 21 and slanting backwardly from`the cutting edge. This constitutes a very firm arrangement and thetightening up of the 'bolts 23 `forces the jaws into a rigidrposition onthe ends of the aw levers. to the parallel slant of the surfaces 20and21 the steel jaws cannot become slightly tilted after-use and, inassembling and replacing, theynecessarily assume the correct position.

@wing Furthermore even-if thebolts get loose the tool can still be 'usedtemporarily for cutting purposes on account of theparallel slantingsurfaces on which they are supported.

In order to make the whole device operate more easily, the pivot bolt 30on which the two handle levers 10 are pivoted, is provided with a ballor roller bearing 31 having a casing 32 which is held by the two arms 33extending from the handle levers 10. These two arms 33 are formed attheir ends as circular hubs, one of which is located at the center andthe other of which is bifurcated and surroundsit. The anti-frictionbearing 31 vis located to surround the bolt 30 and reduces the frictionon both of the arms 33. With such a heavy tool this ball bearingconstitutes an improved feature because the friction at this point hasbeen excessive in makes of this tool on the market.` It reduces theliability of injuring or breaking the bolt when cutting heavy stock.

Although we have illustrated and described only one form of theinvention, We are aware of the fact that changes can be made therein byany person skilled in the art without departing from the scope of theinvention as expressed in the claims.

CTI

Therefore, we do not wish to be limited to the exact form shown, butwhat we do claim 1s:-

l. In a bolt cutter, the combination with a pair of hand levers and apair of jaw levers pivoted together, said jaw levers having a notch inthe inner side of each with a backwardly slanting or undercut rear edgeand a plane wall parallel to the line of thrust and a rforward edge inadvance of the same slanting in a substantially parallel direction butoff-set laterally therefrom, thus forming a Z-shaped outline, of a pairof removable steel jaws secured thereto and lhaving surfaces fittingsaid plane and slanting surfaces, whereby the steel jaws will have abearing on both of said slanting surfaces, and bolts for securing thesteel jaws in position on the said jaws, whereby even if the bolts getloose the jaws will tend to remain in position.

2. In a bolt cutter, the combination with a pair ofhand levers and aleverage system having a pair of jaws at the end, each jaw beingprovided with a notch on one side having a backwardly slanting orundercut rear edge and a plane wall parallel to the'line of thrust and aforward edge in advance of the same but in a differentplane slantin'g ina substantially parallel direction, of a remov` able steel jaw securedthereto and having surfaces fitting said plane and slanting surfaces,the cutting edge being located with its l median line in a plane betweenthe planes of said slanting surfaces, and bolts for securing the steeljaws in position on the said jaws.

In testimony whereof we have hereunto affixed our signatures. v

HENRY P. BLUMENAUER. FRANK D. BRISSE. WILLIAM C. BRISSE.

